I've heard plenty rumors but I figured someone on here would now the real answer. Will an F20B S2000 crankshaft and connecting rods work in an H-Series motor? I've heard that people have done it and easily spun the motor up to 9000 rpm's. Please enlighten me. If this is true I wouldn't mind trying it.


Modified by dk4ever at 9:18 AM 5/30/2007

 

it only has an 84mm stoke. I don't know why you would want to, as you will lose compression, and I don't eve know if it would work. Im still trying to find all the specs

 

Well I've found out with JDM H22 Type-S pistons added in the mix it will have a compression ratio of 11.3:1 and rev all the way to 9000 rpms. So it will be a compression increase but a displacement drop. It will go from 2.2L or 2.3L to 2.1L

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dk4ever &raquo;</TD></TR><TR><TD CLASS="quote">Well I've found out with JDM H22 Type-S pistons added in the mix it will have a compression ratio of 11.3:1 and rev all the way to 9000 rpms. So it will be a compression increase but a displacement drop. It will go from 2.2L or 2.3L to 2.1L</TD></TR></TABLE>

not an f20c crank...more stroke = more compression...

you are going from a 90 mm stroke to an 84 mm stroke...

damn, it's too early, looks like Im gonna search some more. There is **** for info on the f20c crank. I dont even know if it will fit. I think it has 55mm mains, so an h22a4 would be your only hope.

 

Well the s2000 has a timing chain. So lets start out that if you want it to fit, it is going to need some work to fit the pulley for the timing belt.

Not saying it can't be done.

I know they modify the f20 cranks and maybe the H to fit into the K series blocks.

I can't do to much research because I am at work.

 

and you EDITED your first post. you first posted an f20c crankshaft. the f20b did not come in the s2k.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .BigSexy &raquo;</TD></TR><TR><TD CLASS="quote">and you EDITED your first post. you first posted an f20c crankshaft. the f20b did not come in the s2k. </TD></TR></TABLE>

I think he is confusing cars and motors. He posted the same thing on PP.

 

whats your reasoning for dropping the stroke 6mm?

 

isn't the deck height of the f20c block shorter than an h22? as well as haveing shorter rods?

 

an f20b doesn't come in a s2k. i read an article about someone runing an s2k crank in an h22 somewhere (i think)

but a big fat car needs more stroke to make the midrange torque to get the car moving. having such a small stroke in a prelude would not be a great idea. if you want to put a crank in then get a f20b crank and rods and turn it to 9500.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by prelittlelude &raquo;</TD></TR><TR><TD CLASS="quote">an f20b doesn't come in a s2k. i read an article about someone runing an s2k crank in an h22 somewhere (i think)

but a big fat car needs more stroke to make the midrange torque to get the car moving. having such a small stroke in a prelude would not be a great idea. if you want to put a crank in then get a f20b crank and rods and turn it to 9500.</TD></TR></TABLE>
\
he originally posted an f20c crank, but edited later

 

Well this is the setup I'm going to use and the numbers calculated.

H22 block (87mm bore, 219.5mm deck height)
F20B crank (88mm Stroke)
H22 Head (53.8cc combustion chamber)
H22-S Pistons (3.90cc dome, 31mm compression height)
F20B (145 mm Rods Lengh)
OEM 3-layer HG (.026 in Thick)

All that equals to 11.3:1 Compression. And 2092.5cc of displacement. Resulting in an H21S. With a fully built head, Revving to 9000 seems very realistic.

Yeah I had f20c up first then edited it.

 

why would u reduce stroke?

 

Theres many things that denote how high you should rev your motor.

One major one is the head. which sounds like you are keeping stock. WHich is a bad Idea if you want to take it to 9000rpm.
Also you are dealing with f20 rods and putting bigger and heavier h22 pistons. I have not done the research but you want to watch out for piston speed and forces whenever you start mixing and matching rods, pistons, stroke.
Also will it make power that high. SO is 9000rpm in your usable rpm range. It probably isn't with the h22 head unless you do some major headwork.

He thinks reducing the stroke is helping him get to the 9000rpm redline. He is forgeting other things.

I think you might want to research before you have a motor that "will" rev to 9000rpm but is useless up there.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kulrevon &raquo;</TD></TR><TR><TD CLASS="quote">Theres many things that denote how high you should rev your motor.

One major one is the head. which sounds like you are keeping stock. WHich is a bad Idea if you want to take it to 9000rpm.
Also you are dealing with f20 rods and putting bigger and heavier h22 pistons. I have not done the research but you want to watch out for piston speed and forces whenever you start mixing and matching rods, pistons, stroke.
Also will it make power that high. SO is 9000rpm in your usable rpm range. It probably isn't with the h22 head unless you do some major headwork.

He thinks reducing the stroke is helping him get to the 9000rpm redline. He is forgeting other things.

I think you might want to research before you have a motor that "will" rev to 9000rpm but is useless up there. </TD></TR></TABLE>

I think he may be forgetting that although he will rev to 9k, he will probably only make pwoer to about 7800, from what it seems, it s stock h22 with a lower stroke an type s pistons.

 

floating valve anyone? there is a point AND time when your cams are spinning so fast that your valve springs arent stout enough to close the valve resulting in a valve open constantly without the opportunityu to closeeee

this is true.

Dan

 

ok , that is a great combo but with all stock parts its just no goign to make power to 9000, peroid .

the h22 head is one of the better flowing heads (more the B series ) but valvetrain and cams will need to be match to the rpm requiered , not to mention intake manifold

 

https://honda-tech.com/zerothread?id=316401

Here's another F20B Frankenstein engine. Check it out, it's pretty informative. From what I've read the F20B uses a Euro-R head/im. But yea you could do this, all the F20B is supposed to be is a destroked H22 with main diff and only real diff being the crank.

 

ok vtecluder you really need to stop throwing out all this crap about f20bs, it DOESNOT have the euro R manifold , youv been wrong in so many other threads , do you own one , i have one 20feet from me . the heads is its own casting , not type s or euro R

not trying to be a dick but its gettign out of hand

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by machine4321 &raquo;</TD></TR><TR><TD CLASS="quote">ok vtecluder you really need to stop throwing out all this crap about f20bs, it DOESNOT have the euro R manifold , youv been wrong in so many other threads , do you own one , i have one 20feet from me . the heads is its own casting , not type s or euro R

not trying to be a dick but its gettign out of hand </TD></TR></TABLE>



Again it's an obscure motor. I don't care if I'm wrong, I've been wrong before and I'll be wrong again. Can you give me correct information about the head then? Is it completely dis-similar to a Euro-R or Type-S head? Does the IM have butterflies?

 

A F20b is the jdm equivalent to the h23a1. Nothing special at all, no euro r, no type s anything.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pinecone &raquo;</TD></TR><TR><TD CLASS="quote">A F20b is the jdm equivalent to the h23a1. Nothing special at all, no euro r, no type s anything.</TD></TR></TABLE>

f22b you mean.

f20b is a destroked h22.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94Vtecluder &raquo;</TD></TR><TR><TD CLASS="quote">



Again it's an obscure motor. I don't care if I'm wrong, I've been wrong before and I'll be wrong again. Can you give me correct information about the head then? Is it completely dis-similar to a Euro-R or Type-S head? Does the IM have butterflies? </TD></TR></TABLE>

if you are wrong? then why are you spreading this misinformation...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by road.head &raquo;</TD></TR><TR><TD CLASS="quote">

f22b you mean.

f20b is a destroked h22.</TD></TR></TABLE>

what's the R/S ratio?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .BigSexy &raquo;</TD></TR><TR><TD CLASS="quote">if you are wrong? then why are you spreading this misinformation...</TD></TR></TABLE>

Because I don't have ESPNnews.